/**
  ******************************************************************************
  * @file    LwIP/LwIP_HTTP_Server_Raw/Src/ethernetif.c
  * @author  MCD Application Team
  * @brief   This file implements Ethernet network interface drivers for lwIP
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under Ultimate Liberty license
  * SLA0044, the "License"; You may not use this file except in compliance with
  * the License. You may obtain a copy of the License at:
  *                             www.st.com/SLA0044
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32h7xx_hal.h"
#include "lwip/opt.h"
#include "lwip/timeouts.h"
#include "lwip/netif.h"
#include "netif/etharp.h"
#include "ethernetif.h"
#include "lan8742.h"
#include "param.h"
#include <string.h>

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/

#if 1
#define ETH_MAC_ADDR0 g_tVar.MACaddr[0]
#define ETH_MAC_ADDR1 g_tVar.MACaddr[1]
#define ETH_MAC_ADDR2 g_tVar.MACaddr[2]
#define ETH_MAC_ADDR3 g_tVar.MACaddr[3]
#define ETH_MAC_ADDR4 g_tVar.MACaddr[4]
#define ETH_MAC_ADDR5 g_tVar.MACaddr[5]
#else
#define ETH_MAC_ADDR0 ((uint8_t)0x02)
#define ETH_MAC_ADDR1 ((uint8_t)0x00)
#define ETH_MAC_ADDR2 ((uint8_t)0x00)
#define ETH_MAC_ADDR3 ((uint8_t)0x00)
#define ETH_MAC_ADDR4 ((uint8_t)0x00)
#define ETH_MAC_ADDR5 ((uint8_t)0x00)
#endif

/* Network interface name */
#define IFNAME0 's'
#define IFNAME1 't'

#define ETH_RX_BUFFER_SIZE (1536UL)

#define ETH_DMA_TRANSMIT_TIMEOUT                (20U)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* 
@Note: This interface is implemented to operate in zero-copy mode only:
        - Rx buffers are allocated statically and passed directly to the LwIP stack,
          they will return back to ETH DMA after been processed by the stack.
        - Tx Buffers will be allocated from LwIP stack memory heap, 
          then passed to ETH HAL driver.

@Notes: 
  1.a. ETH DMA Rx descriptors must be contiguous, the default count is 4, 
       to customize it please redefine ETH_RX_DESC_CNT in stm32xxxx_hal_conf.h
  1.b. ETH DMA Tx descriptors must be contiguous, the default count is 4, 
       to customize it please redefine ETH_TX_DESC_CNT in stm32xxxx_hal_conf.h

  2.a. Rx Buffers number must be between ETH_RX_DESC_CNT and 2*ETH_RX_DESC_CNT
  2.b. Rx Buffers must have the same size: ETH_RX_BUFFER_SIZE, this value must
       passed to ETH DMA in the init field (EthHandle.Init.RxBuffLen)
  2.c  The RX Ruffers addresses and sizes must be properly defined to be aligned
       to L1-CACHE line size (32 bytes).
*/

#if defined ( __ICCARM__ ) /*!< IAR Compiler */

#pragma location=0x30040000
ETH_DMADescTypeDef  DMARxDscrTab[ETH_RX_DESC_CNT]; /* Ethernet Rx DMA Descriptors */
#pragma location=0x30040060
ETH_DMADescTypeDef  DMATxDscrTab[ETH_TX_DESC_CNT]; /* Ethernet Tx DMA Descriptors */
#pragma location=0x30040200
uint8_t Rx_Buff[ETH_RX_DESC_CNT][ETH_RX_BUFFER_SIZE]; /* Ethernet Receive Buffers */

#elif defined ( __CC_ARM )  /* MDK ARM Compiler */

__attribute__((section(".RxDecripSection"))) ETH_DMADescTypeDef  DMARxDscrTab[ETH_RX_DESC_CNT]; /* Ethernet Rx DMA Descriptors */
__attribute__((section(".TxDecripSection"))) ETH_DMADescTypeDef  DMATxDscrTab[ETH_TX_DESC_CNT]; /* Ethernet Tx DMA Descriptors */
__attribute__((section(".RxArraySection"))) uint8_t Rx_Buff[ETH_RX_DESC_CNT][ETH_RX_BUFFER_SIZE]; /* Ethernet Receive Buffer */

#elif defined(__GNUC__) /* GNU Compiler */

ETH_DMADescTypeDef DMARxDscrTab[ETH_RX_DESC_CNT] __attribute__((section(".RxDecripSection"))); /* Ethernet Rx DMA Descriptors */
ETH_DMADescTypeDef DMATxDscrTab[ETH_TX_DESC_CNT] __attribute__((section(".TxDecripSection")));   /* Ethernet Tx DMA Descriptors */
uint8_t Rx_Buff[ETH_RX_DESC_CNT][ETH_RX_BUFFER_SIZE] __attribute__((section(".RxArraySection"))); /* Ethernet Receive Buffers */

#endif

struct pbuf_custom rx_pbuf[ETH_RX_DESC_CNT];
uint32_t current_pbuf_idx = 0;

ETH_HandleTypeDef EthHandle;
ETH_TxPacketConfig TxConfig;

uint32_t PHYLinkState = 0;
uint32_t PHYLinkChanged = 0;

lan8742_Object_t LAN8742;

/* Private function prototypes -----------------------------------------------*/
u32_t sys_now(void);
void pbuf_free_custom(struct pbuf *p);

int32_t ETH_PHY_IO_Init(void);
int32_t ETH_PHY_IO_DeInit (void);
int32_t ETH_PHY_IO_ReadReg(uint32_t DevAddr, uint32_t RegAddr, uint32_t *pRegVal);
int32_t ETH_PHY_IO_WriteReg(uint32_t DevAddr, uint32_t RegAddr, uint32_t RegVal);
int32_t ETH_PHY_IO_GetTick(void);

lan8742_IOCtx_t LAN8742_IOCtx = {ETH_PHY_IO_Init,
                                 ETH_PHY_IO_DeInit,
                                 ETH_PHY_IO_WriteReg,
                                 ETH_PHY_IO_ReadReg,
                                 ETH_PHY_IO_GetTick};

LWIP_MEMPOOL_DECLARE(RX_POOL, 10, sizeof(struct pbuf_custom), "Zero-copy RX PBUF pool");

/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
                       LL Driver Interface ( LwIP stack --> ETH) 
*******************************************************************************/
/**
  * @brief In this function, the hardware should be initialized.
  * Called from ethernetif_init().
  *
  * @param netif the already initialized lwip network interface structure
  *        for this ethernetif
  */
static void low_level_init(struct netif *netif)
{
  uint32_t idx = 0;
  uint8_t macaddress[6]= {ETH_MAC_ADDR0, ETH_MAC_ADDR1, ETH_MAC_ADDR2, ETH_MAC_ADDR3, ETH_MAC_ADDR4, ETH_MAC_ADDR5};
  
  EthHandle.Instance = ETH;  
  EthHandle.Init.MACAddr = macaddress;
  EthHandle.Init.MediaInterface = HAL_ETH_RMII_MODE;
  EthHandle.Init.RxDesc = DMARxDscrTab;
  EthHandle.Init.TxDesc = DMATxDscrTab;
  EthHandle.Init.RxBuffLen = ETH_RX_BUFFER_SIZE;
  
  /* configure ethernet peripheral (GPIOs, clocks, MAC, DMA) */
  HAL_ETH_Init(&EthHandle);
  
  /* set MAC hardware address length */
  netif->hwaddr_len = ETH_HWADDR_LEN;
  
  /* set MAC hardware address */
  netif->hwaddr[0] = macaddress[0];
  netif->hwaddr[1] = macaddress[1];
  netif->hwaddr[2] = macaddress[2];
  netif->hwaddr[3] = macaddress[3];
  netif->hwaddr[4] = macaddress[4];
  netif->hwaddr[5] = macaddress[5];

  /* maximum transfer unit */
  netif->mtu = ETH_MAX_PAYLOAD;

  /* device capabilities */
  /* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
  netif->flags |= NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP;

  for (idx = 0; idx < ETH_RX_DESC_CNT; idx++)
  {
    HAL_ETH_DescAssignMemory(&EthHandle, idx, Rx_Buff[idx], NULL);
  }

  /* Initialize the RX POOL */
  LWIP_MEMPOOL_INIT(RX_POOL);

  /* Set Tx packet config common parameters */
  memset(&TxConfig, 0, sizeof(ETH_TxPacketConfig));
  TxConfig.Attributes = ETH_TX_PACKETS_FEATURES_CSUM | ETH_TX_PACKETS_FEATURES_CRCPAD;
  TxConfig.ChecksumCtrl = ETH_CHECKSUM_IPHDR_PAYLOAD_INSERT_PHDR_CALC;
  TxConfig.CRCPadCtrl = ETH_CRC_PAD_INSERT;

  /* Set PHY IO functions */
  LAN8742_RegisterBusIO(&LAN8742, &LAN8742_IOCtx);

  /* Initialize the LAN8742 ETH PHY */
  LAN8742_Init(&LAN8742);

  ethernet_link_check_state(netif);
}

/**
  * @brief This function should do the actual transmission of the packet. The packet is
  * contained in the pbuf that is passed to the function. This pbuf
  * might be chained.
  *
  * @param netif the lwip network interface structure for this ethernetif
  * @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
  * @return ERR_OK if the packet could be sent
  *         an err_t value if the packet couldn't be sent
  *
  * @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
  *       strange results. You might consider waiting for space in the DMA queue
  *       to become availale since the stack doesn't retry to send a packet
  *       dropped because of memory failure (except for the TCP timers).
  */
static err_t low_level_output(struct netif *netif, struct pbuf *p)
{
  uint32_t i=0;
  struct pbuf *q;
  err_t errval = ERR_OK;
  ETH_BufferTypeDef Txbuffer[ETH_TX_DESC_CNT];
  
  memset(Txbuffer, 0 , ETH_TX_DESC_CNT*sizeof(ETH_BufferTypeDef));
  
  for(q = p; q != NULL; q = q->next)
  {
    if(i >= ETH_TX_DESC_CNT)	
      return ERR_IF;

    Txbuffer[i].buffer = q->payload;
    Txbuffer[i].len = q->len;

    if(i>0)
    {
      Txbuffer[i - 1].next = &Txbuffer[i];
    }

    if (q->next == NULL)
    {
      Txbuffer[i].next = NULL;
    }

    i++;
  }

  TxConfig.Length = p->tot_len;
  TxConfig.TxBuffer = Txbuffer;

  HAL_ETH_Transmit(&EthHandle, &TxConfig, ETH_DMA_TRANSMIT_TIMEOUT);
  
  return errval;
}

/**
  * @brief Should allocate a pbuf and transfer the bytes of the incoming
  * packet from the interface into the pbuf.
  *
  * @param netif the lwip network interface structure for this ethernetif
  * @return a pbuf filled with the received packet (including MAC header)
  *         NULL on memory error
  */
static struct pbuf *low_level_input(struct netif *netif)
{
  struct pbuf *p = NULL;
  ETH_BufferTypeDef RxBuff[ETH_RX_DESC_CNT];
  uint32_t framelength = 0, i = 0;;
  struct pbuf_custom* custom_pbuf;

  memset(RxBuff, 0 , ETH_RX_DESC_CNT*sizeof(ETH_BufferTypeDef));

  for(i = 0; i < ETH_RX_DESC_CNT -1; i++)
  {
    RxBuff[i].next=&RxBuff[i+1];
  }
  
  if (HAL_ETH_IsRxDataAvailable(&EthHandle))
  {
    HAL_ETH_GetRxDataBuffer(&EthHandle, RxBuff);
    HAL_ETH_GetRxDataLength(&EthHandle, &framelength);
    
    /* Build Rx descriptor to be ready for next data reception */
	HAL_ETH_BuildRxDescriptors(&EthHandle);

    /* Invalidate data cache for ETH Rx Buffers */
    SCB_InvalidateDCache_by_Addr((uint32_t *)RxBuff->buffer, framelength);
    
    custom_pbuf  = (struct pbuf_custom*)LWIP_MEMPOOL_ALLOC(RX_POOL);
    if(custom_pbuf != NULL)
    {
      custom_pbuf->custom_free_function = pbuf_free_custom;
      p = pbuf_alloced_custom(PBUF_RAW, framelength, PBUF_REF, custom_pbuf, RxBuff->buffer, framelength);
    }
    
    return p;
  }
  else
  {
    return NULL;
  }
}

/**
  * @brief This function is the ethernetif_input task, it is processed when a packet 
  * is ready to be read from the interface. It uses the function low_level_input() 
  * that should handle the actual reception of bytes from the network
  * interface. Then the type of the received packet is determined and
  * the appropriate input function is called.
  *
  * @param netif the lwip network interface structure for this ethernetif
  */
void ethernetif_input(struct netif *netif)
{
  err_t err;
  struct pbuf *p;

  /* move received packet into a new pbuf */
  p = low_level_input(netif);
    
  /* no packet could be read, silently ignore this */
  if (p == NULL) return;
    
  /* entry point to the LwIP stack */
  err = netif->input(p, netif);
    
  if (err != ERR_OK)
  {
    LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
    pbuf_free(p);
    p = NULL;
  }
}

/**
  * @brief Should be called at the beginning of the program to set up the
  * network interface. It calls the function low_level_init() to do the
  * actual setup of the hardware.
  *
  * This function should be passed as a parameter to netif_add().
  *
  * @param netif the lwip network interface structure for this ethernetif
  * @return ERR_OK if the loopif is initialized
  *         ERR_MEM if private data couldn't be allocated
  *         any other err_t on error
  */
err_t ethernetif_init(struct netif *netif)
{
  LWIP_ASSERT("netif != NULL", (netif != NULL));

#if LWIP_NETIF_HOSTNAME
  /* Initialize interface hostname */
  netif->hostname = "lwip";
#endif /* LWIP_NETIF_HOSTNAME */

  netif->name[0] = IFNAME0;
  netif->name[1] = IFNAME1;
  /* We directly use etharp_output() here to save a function call.
   * You can instead declare your own function an call etharp_output()
   * from it if you have to do some checks before sending (e.g. if link
   * is available...) */
  netif->output = etharp_output;
  netif->linkoutput = low_level_output;

  /* initialize the hardware */
  low_level_init(netif);

  return ERR_OK;
}

/**
  * @brief  Custom Rx pbuf free callback
  * @param  pbuf: pbuf to be freed
  * @retval None
  */
void pbuf_free_custom(struct pbuf *p)
{
  struct pbuf_custom* custom_pbuf = (struct pbuf_custom*)p;
  LWIP_MEMPOOL_FREE(RX_POOL, custom_pbuf);
}

/**
  * @brief  Returns the current time in milliseconds
  *         when LWIP_TIMERS == 1 and NO_SYS == 1
  * @param  None
  * @retval Current Time value
  */
u32_t sys_now(void)
{
  return HAL_GetTick();
}
/*******************************************************************************
                       Ethernet MSP Routines
*******************************************************************************/
/**
  * @brief  Initializes the ETH MSP.
  * @param  heth: ETH handle
  * @retval None
  */
void HAL_ETH_MspInit(ETH_HandleTypeDef *heth)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Ethernett MSP init: RMII Mode 
      CPU                   H7-TOOL  STM32-V7  ST  
      RX_CLK  -------------->  PA1      PA1    PA1
      TXD0    -------------->  PG13     PG13   PB12   ---
      TXD1    -------------->  PG14     PB13   PB13 
      RXD0    -------------->  PC4      PC4    PC4
      RXD1    -------------->  PC5      PC5    PC5
      TX_EN   -------------->  PG11     PG11   PB11   ---
      RX_DV   -------------->  PA7      PA7    PA7
      
      MDC     -------------->  PC1      PC1    PC1
      MDIO    -------------->  PA2      PA2    PA2        
  */

  /* Enable GPIOs clocks */
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOG_CLK_ENABLE();

  /* Configure PA1, PA2 , PA7 */
  GPIO_InitStructure.Pin = GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_7;
  GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_MEDIUM; // GPIO_SPEED_FREQ_MEDIUM;    // GPIO_SPEED_FREQ_LOW; // GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStructure.Pull = GPIO_NOPULL;
  GPIO_InitStructure.Alternate = GPIO_AF11_ETH;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure PC1, PC4 and PC5 */
  GPIO_InitStructure.Pin = GPIO_PIN_1 | GPIO_PIN_4 | GPIO_PIN_5;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);

  /* Configure PG11, PG12 and PG13 */
  GPIO_InitStructure.Pin = GPIO_PIN_11 | GPIO_PIN_13 | GPIO_PIN_14;
  HAL_GPIO_Init(GPIOG, &GPIO_InitStructure);

  /* Enable Ethernet clocks */
  __HAL_RCC_ETH1MAC_CLK_ENABLE();
  __HAL_RCC_ETH1TX_CLK_ENABLE();
  __HAL_RCC_ETH1RX_CLK_ENABLE();
}

/*******************************************************************************
                       PHI IO Functions
*******************************************************************************/
/**
  * @brief  Initializes the MDIO interface GPIO and clocks.
  * @param  None
  * @retval 0 if OK, -1 if ERROR
  */
int32_t ETH_PHY_IO_Init(void)
{
  /* We assume that MDIO GPIO configuration is already done
     in the ETH_MspInit() else it should be done here 
  */

  /* Configure the MDIO Clock */
  HAL_ETH_SetMDIOClockRange(&EthHandle);

  return 0;
}

/**
  * @brief  De-Initializes the MDIO interface .
  * @param  None
  * @retval 0 if OK, -1 if ERROR
  */
int32_t ETH_PHY_IO_DeInit(void)
{
  return 0;
}

/**
  * @brief  Read a PHY register through the MDIO interface.
  * @param  DevAddr: PHY port address
  * @param  RegAddr: PHY register address
  * @param  pRegVal: pointer to hold the register value 
  * @retval 0 if OK -1 if Error
  */
int32_t ETH_PHY_IO_ReadReg(uint32_t DevAddr, uint32_t RegAddr, uint32_t *pRegVal)
{
  if(HAL_ETH_ReadPHYRegister(&EthHandle, DevAddr, RegAddr, pRegVal) != HAL_OK)
  {
    return -1;
  }
  
  return 0;
}

/**
  * @brief  Write a value to a PHY register through the MDIO interface.
  * @param  DevAddr: PHY port address
  * @param  RegAddr: PHY register address
  * @param  RegVal: Value to be written 
  * @retval 0 if OK -1 if Error
  */
int32_t ETH_PHY_IO_WriteReg(uint32_t DevAddr, uint32_t RegAddr, uint32_t RegVal)
{
  if(HAL_ETH_WritePHYRegister(&EthHandle, DevAddr, RegAddr, RegVal) != HAL_OK)
  {
    return -1;
  }
  
  return 0;
}

/**
  * @brief  Get the time in millisecons used for internal PHY driver process.
  * @retval Time value
  */
int32_t ETH_PHY_IO_GetTick(void)
{
  return HAL_GetTick();
}

/**
  * @brief  
  * @retval None
  */
void ethernet_link_check_state(struct netif *netif)
{
  ETH_MACConfigTypeDef MACConf;
  //  uint32_t PHYLinkState;
  uint32_t linkchanged = 0;
  uint32_t speed = 0, duplex = 0;

  PHYLinkState = LAN8742_GetLinkState(&LAN8742);

  if (netif_is_link_up(netif) && (PHYLinkState <= LAN8742_STATUS_LINK_DOWN))
  {
    PHYLinkChanged = 1; /* 给上层app用 */

    HAL_ETH_Stop(&EthHandle);
    netif_set_down(netif);
    netif_set_link_down(netif);
  }
  else if (!netif_is_link_up(netif) && (PHYLinkState > LAN8742_STATUS_LINK_DOWN))
  {
    PHYLinkChanged = 1; /* 给上层app用 */

    switch (PHYLinkState)
    {
        case LAN8742_STATUS_100MBITS_FULLDUPLEX:
          duplex = ETH_FULLDUPLEX_MODE;
          speed = ETH_SPEED_100M;
          linkchanged = 1;
          break;
        case LAN8742_STATUS_100MBITS_HALFDUPLEX:
          duplex = ETH_HALFDUPLEX_MODE;
          speed = ETH_SPEED_100M;
          linkchanged = 1;
          break;
        case LAN8742_STATUS_10MBITS_FULLDUPLEX:
          duplex = ETH_FULLDUPLEX_MODE;
          speed = ETH_SPEED_10M;
          linkchanged = 1;
          break;
        case LAN8742_STATUS_10MBITS_HALFDUPLEX:
          duplex = ETH_HALFDUPLEX_MODE;
          speed = ETH_SPEED_10M;
          linkchanged = 1;
          break;
        default:
          break;
    }

    if (linkchanged)
    {
      /* Get MAC Config MAC */
      HAL_ETH_GetMACConfig(&EthHandle, &MACConf);
      MACConf.DuplexMode = duplex;
      MACConf.Speed = speed;
      HAL_ETH_SetMACConfig(&EthHandle, &MACConf);
      HAL_ETH_Start(&EthHandle);
      netif_set_up(netif);
      netif_set_link_up(netif);
    }
  }
}

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
